Coil-retaining means for electrical machines.



PATENTED JULY I9, 1904.

I. DE KAISER.

COIL EETAINING MEANS EOE. ELECTRICAL MACHINES. v

APPLICATION FILED NOV. 21, 1903.

N0 MODEL.

INVENTOR Jim/v W/TNESSES: JM

/1 TT'ORNEY UNITED STATES Patented July 19, 1904.

PATENT OEEIcE.

ISAAC DE KAISER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC 8c MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COIL-RETAINING MEANS FOR ELECTRICAL MACHINES.

SPECIFICATION forming part of Letters Patent No. 765,228, dated July 19,1904. Application filed November 2l, 1903. Serial No. 182,168. (Nomodel.)

To all whom 'it may concern:

Be it known that I, ISAAC DE KAISER, acitizen of the United States, anda resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement inCoil-Retaining Means teeth 3, between which are slots 4 for' the re-Vception of coils 5. The sides of the teeth 3 adjacent to their free endsare provided with grooves 6, which extend inwardlyfrom the ends of thecore a short distance only, and the beveled edges of small fiber strips7 are fitted tightly into these grooves after the coils are in place. IftheA grooves' extended entirely across the core, the cross-sectionalarea of the teeth would be materially reduced, thus causing a higheriiux density at the ends of the teeth for the same winding on the corethan would be produced if there were no grooves in the teeth. Suchconstruction has been employed and has been found to be objectionableforthe reason stated. By employing my invention the cross-sectional areaof the ends of the teeth is not reduced except at the extreme ends ofthe core, and at the same time a very simple and easily-applied means isprovided for retaining the coils in proper position.

It is evident that my invention may be employed in all classes ofelectrical apparatus where its application is possible, and consequentlyI do not Wish it limited to the specific apparatus shown and described.

Iclaim as my invention l. In electrical apparatus, a core having teethwhich form slots for the reception of coils and are provided withVgrooves adjacent to their free ends which extend inwardly a shortdistance only from the ends of the core.

Y2. In electrical apparatus, a core having teeth which form slots forthe reception of vcoils and arel provided with grooves in their sidesand adjacent to their free ends which extend from the ends of the coreonly part Wayacross it, and core-retaining strips the edges of which litinto said grooves.

3. In electrical apparatus, a core having teeth which form slots toreceive coils and are provided with grooves in their sides and neartheir free ends but extending inwardly only short distances from theends of the core, and coil-retaining strips the edges of which lit intothe grooves in adjacent teeth.

-In testimony whereof I have hereunto subscribed my name this 13th dayof November,

ISAAC DE KAISER.

Witnesses:

CIIAs. C. TYLER, BIRNEY HINEs.

